I've just updated the plugin to version 1.1.5 and it suddenly stopped working at all. The only difference I can see now in the box under the post contents is that WP SEO is making my links in the "www.name.com/post-name/" structure whereas I am using html endings for my pages so my post url structure is "www.name.com/year/post-title.html".

I've never had problems with such structure with WP SEO plugin up to version 1.1.4 and now it's stopped working - the snipped is not updating :(

Now I read on Yoast page that I should start with changing my link structure to "www.name.com/post-name/" - is this the only solution? Can I stay with my old link structure and still use WP SEO?